rn: drop support for beta.meet.jit.si over HTTP

It doesn't add any value, by default HTTP is not supported unless an exception
is added, plus it doesn't work in browsers at all.

ios/app/src/Info.plist

 	<dict>
 		<key>NSExceptionDomains</key>
 		<dict>
-			<key>beta.meet.jit.si</key>
-			<dict>
-				<key>NSTemporaryExceptionAllowsInsecureHTTPLoads</key>
-				<true/>
-			</dict>
 			<key>localhost</key>
 			<dict>
 				<key>NSTemporaryExceptionAllowsInsecureHTTPLoads</key>